Dundee Sustainable Technologies Enters Into an Agreement for the Treatment of Arsenical Flue Dusts With a Major Copper Mining Company

MONTREAL, QUEBEC--(Marketwired - Sept. 15, 2015) - Dundee Sustainable Technologies Inc. ("DST") (CSE:DST) is pleased to announce that it has entered into an agreement with a major copper mining company (the "COMPANY") for the treatment of arsenic-bearing flue dusts (the "Flue Dusts") produced by the COMPANY's operations, using DST's proprietary Technology.

The objective of this Agreement is to establish a two-phase approach aimed, on a first phase, to demonstrate the DST process in a 1-Tonne per day plant (the "Plant"), with the ultimate goal of defining the terms for the treatment, in phase two, of the Flue Dusts on a commercial basis.

Arsenical Flue Dusts are produced through copper smelting of arsenical ores. During the smelting-converting process of copper most of the arsenic is volatilised and reports in the Flue Dusts as arsenic trioxide along with finely divided metal or metallic compounds.

About Dundee Sustainable Technologies, a company controlled by Dundee Corporation

DST has developed a new patent pending process for the stabilization of arsenic in a stable glass form. This method uses chemicals at a lower cost to produce a more stable product than current industrial practices. This approach to stabilize arsenic is becoming an attractive technique to segregate the toxic material and is therefore opening opportunities for deposits, concentrates and material considered to contain too much arsenic to be exploited or stabilised using conventional approaches. DST has filed patent applications for this in several countries.

DST is also engaged in the development of technologies for the treatment of refractory ores containing sulfides and arsenic. DST has developed proprietary hydrometallurgical processes, and owns the related patents, for the extraction of precious and base metals from ores, concentrates and tailings, which cannot be extracted with conventional processes because of metallurgical issues or environmental considerations.

DST's approach provides a cyanide-free process to allow the exploitation of gold and other deposits that would otherwise face metallurgical issues with conventional methods. The primary benefits of the innovative technology are shorter processing times, a closed-loop operation eliminating the need for costly tailings pond, reduced environmental footprint related to inert and stable characteristics of the tailings, and lesser emissions due to lower energy consumption.

The process developed by DST is a recognized "green technology" for which it was awarded a $5.7 million grant towards the construction and operation of a $25 million demonstration plant. With a capacity of 15 tonnes per day of concentrate, the demonstration plant will serve as a proof of concept for the chlorination extraction technology on an industrial scale and under continuous operating conditions.

DST has tested several different gold deposits, both oxide and sulfide ores at the lab level and at its pilot plant. These tests have, consistently achieved gold recoveries in excess of 90%, using chlorination instead of cyanide.

FORWARD LOOKING STATEMENTS: This press release contains forward-looking statements that address future events and conditions, which are subject to various risks and uncertainties. Actual results could differ materially from those anticipated in such forward-looking statements as a result of numerous factors, some of which may be beyond the Corporation's control. These factors include: general market and industry conditions, risks related to continuous operations and to commercialization of a new technology and other risks disclosed in the Corporation's filings with Canadian Securities Regulators.

Forward-looking statements are based on the expectations and opinions of the Corporation's management on the date the statements are made. The assumptions used in the preparation of such statements, although considered reasonable at the time of preparation, may prove to be imprecise and, as such, undue reliance should not be placed on forward-looking statements. The Corporation expressly disclaims any intention or obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise, except as required by applicable law.

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